Association of PD-L1 expression on tumor-infiltrating mononuclear cells and overall survival in patients with urothelial carcinoma. - Bellmunt, J.; Mullane, S. A.; Werner, L.; Fay, A. P.; Callea, M.; Leow, J. J.; Taplin, M. E.; Choueiri, T. K.; Hodi, F. S.; Freeman, G. J.; Signoretti, S. (Annals of Oncology, 2015)